"You're always on your own with off-brand lenses like Sigma. Readers tell me that their Sigma 105 Macros don't work on the D7100. Potential incompatibility with future cameras is one of the steep prices one pays for trying to save a few dollars yesterday on a cheap lens."

LOL. Make your own conclusions.

(people reading this in the future, be aware the D7100 is not shipping until March)

I also like the lens recommendation "Most professionals use the huge 70-200mm VR II all day for everything."